getaddrinfo: allow numeric service without any hints

This appears to correspond to what glibc does and this fixes an
issue with iptables-1.4.11 with udp and raw port numbers.

(see http://bugzilla.netfilter.org/show_bug.cgi?id=721)

This fixes #3841
https://bugs.busybox.net/show_bug.cgi?id=3841

Signed-off-by: Natanael Copa <natanael.copa@gmail.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

libc/inet/getaddrinfo.c

@@ -820,13 +820,6 @@ getaddrinfo(const char *name, const char *service,
 			if (hints->ai_flags & AI_NUMERICSERV)
 				return EAI_NONAME;
 			gaih_service.num = -1;
-		} else {
-			/*
-			 * Can't specify a numerical socket unless a protocol
-			 * family was given.
-			 */
-			if (hints->ai_socktype == 0 && hints->ai_protocol == 0)
-				return EAI_SERVICE;
 		}
 		pservice = &gaih_service;
 	} else